Description: A National Oceanic and Atmospheric Administration map of the entrance to Tampa Bay. This National Ocean Survey chart shows all soundings expressed in feet. Navigational aids such as safety fairways, and visual markers such as lights, buoys, and beacons are shown as well as obstructions such as fixed bridges, submerged ruins, pipes, cables, and piles. Measure of magnetic variance and annual change included. Scale 1:40,000. North American 1927 Datum used. Key to NOAA maps.Source: National Oceanic and Atmospheric Administration, National Ocean Survey (Washington, DC: U.S. Department of Commerce, 1977) Map Credit: Courtesy of the U.S. National Oceanic and Atmospheric Administration